It's something you should complain about with the authors of your adware/avg software programs, as there's no such thing as a virus/spyware/etc. in the mIRC executable, atleast if you downloaded it from the official source, being http://www.mirc.com/get.html

If you download mIRC which is prepacked in a script, or from other sources, there's no telling what some people with malicious intentions have done with the mirc.exe.

Khaled can't do anything to prevent this, it's those scanners that are incorrectly detecting mIRC as malicious software. If it's anything of a decent scanner, you should be able to put mIRC on some sort of exception list, otherwise maybe it's time to look for a better scanner.